diff --git a/tools/ndnsec-list.hpp b/tools/ndnsec-list.hpp
new file mode 100644
index 0000000..b9724d6
--- /dev/null
+++ b/tools/ndnsec-list.hpp
@@ -0,0 +1,190 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ * BSD license, See the LICENSE file for more information
+ * Author: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+#ifndef NDNSEC_LIST_HPP
+#define NDNSEC_LIST_HPP
+
+#include "ndnsec-util.hpp"
+
+int 
+ndnsec_list(int argc, char** argv)	
+{
+  using namespace ndn;
+  namespace po = boost::program_options;
+
+  bool getId = true;
+  bool getKey = false;
+  bool getCert = false;
+
+  po::options_description desc("General Usage\n  ndnsec list [-h] [-K|C]\nGeneral options");
+  desc.add_options()
+    ("help,h", "produce help message")
+    ("key,K", "granularity: key")
+    ("cert,C", "granularity: certificate")
+    ;
+
+  po::variables_map vm;
+  po::store(po::parse_command_line(argc, argv, desc), vm);
+  po::notify(vm);
+
+  if (vm.count("help")) 
+    {
+      std::cerr << desc << std::endl;;
+      return 0;
+    }
+
+  if (vm.count("cert"))
+    {
+      getCert = true;
+      getId = false;
+    }
+  else if(vm.count("key"))
+    {
+      getKey = true;
+      getId = false;
+    }
+
+  try
+    {
+      KeyChain keyChain;
+      
+      if(getId)
+        {
+          std::vector<Name> defaultList;
+          keyChain.getAllIdentities(defaultList, true);
+          for(int i = 0; i < defaultList.size(); i++)
+            std::cout << "* " << defaultList[i] << std::endl;
+          std::vector<Name> otherList;
+          keyChain.getAllIdentities(otherList, false);
+          for(int i = 0; i < otherList.size(); i++)
+            std::cout << "  " << otherList[i] << std::endl;
+          return 0;
+        }
+      if(getKey)
+        {
+          std::vector<Name> defaultIdList;
+          keyChain.getAllIdentities(defaultIdList, true);
+          for(int i = 0; i < defaultIdList.size(); i++)
+            {
+              std::cout << "* " << defaultIdList[i] << std::endl;
+              std::vector<Name> defaultKeyList;
+              keyChain.getAllKeyNamesOfIdentity(defaultIdList[i], defaultKeyList, true);
+              for(int j = 0; j < defaultKeyList.size(); j++)
+                std::cout << "  +->* " << defaultKeyList[j] << std::endl;
+              std::vector<Name> otherKeyList;
+              keyChain.getAllKeyNamesOfIdentity(defaultIdList[i], otherKeyList, false);
+              for(int j = 0; j < otherKeyList.size(); j++)
+                std::cout << "  +->  " << otherKeyList[j] << std::endl;
+              std::cout << std::endl;
+            }
+          std::vector<Name> otherIdList;
+          keyChain.getAllIdentities(otherIdList, false);
+          for(int i = 0; i < otherIdList.size(); i++)
+            {
+              std::cout << "  " << otherIdList[i] << std::endl;
+              std::vector<Name> defaultKeyList;
+              keyChain.getAllKeyNamesOfIdentity(otherIdList[i], defaultKeyList, true);
+              for(int j = 0; j < defaultKeyList.size(); j++)
+                std::cout << "  +->* " << defaultKeyList[j] << std::endl;
+              std::vector<Name> otherKeyList;
+              keyChain.getAllKeyNamesOfIdentity(otherIdList[i], otherKeyList, false);
+              for(int j = 0; j < otherKeyList.size(); j++)
+                std::cout << "  +->  " << otherKeyList[j] << std::endl;
+              std::cout << std::endl;
+            }
+          return 0;
+        }
+      if(getCert)
+        {
+          std::vector<Name> defaultIdList;
+          keyChain.getAllIdentities(defaultIdList, true);
+          for(int i = 0; i < defaultIdList.size(); i++)
+            {
+              std::cout << "* " << defaultIdList[i] << std::endl;
+              std::vector<Name> defaultKeyList;
+              keyChain.getAllKeyNamesOfIdentity(defaultIdList[i], defaultKeyList, true);
+              for(int j = 0; j < defaultKeyList.size(); j++)
+                {
+                  std::cout << "  +->* " << defaultKeyList[j] << std::endl;
+                  std::vector<Name> defaultCertList;
+                  keyChain.getAllCertificateNamesOfKey(defaultKeyList[j], defaultCertList, true);
+                  for(int k = 0; k < defaultCertList.size(); k++)
+                    std::cout << "       +->* " << defaultCertList[k] << std::endl;
+                  std::vector<Name> otherCertList;
+                  keyChain.getAllCertificateNamesOfKey(defaultKeyList[j], otherCertList, false);
+                  for(int k = 0; k < otherCertList.size(); k++)
+                    std::cout << "       +->  " << otherCertList[k] << std::endl;
+                }
+              std::vector<Name> otherKeyList;
+              keyChain.getAllKeyNamesOfIdentity(defaultIdList[i], otherKeyList, false);
+              for(int j = 0; j < otherKeyList.size(); j++)
+                {
+                  std::cout << "  +->  " << otherKeyList[j] << std::endl;
+                  std::vector<Name> defaultCertList;
+                  keyChain.getAllCertificateNamesOfKey(otherKeyList[j], defaultCertList, true);
+                  for(int k = 0; k < defaultCertList.size(); k++)
+                    std::cout << "       +->* " << defaultCertList[k] << std::endl;
+                  std::vector<Name> otherCertList;
+                  keyChain.getAllCertificateNamesOfKey(otherKeyList[j], otherCertList, false);
+                  for(int k = 0; k < otherCertList.size(); k++)
+                    std::cout << "       +->  " << otherCertList[k] << std::endl;
+                }
+            
+              std::cout << std::endl;
+            }
+          std::vector<Name> otherIdList;
+          keyChain.getAllIdentities(otherIdList, false);
+          for(int i = 0; i < otherIdList.size(); i++)
+            {
+              std::cout << "  " << otherIdList[i] << std::endl;
+              std::vector<Name> defaultKeyList;
+              keyChain.getAllKeyNamesOfIdentity(otherIdList[i], defaultKeyList, true);
+              for(int j = 0; j < defaultKeyList.size(); j++)
+                {
+                  std::cout << "  +->* " << defaultKeyList[j] << std::endl;
+                  std::vector<Name> defaultCertList;
+                  keyChain.getAllCertificateNamesOfKey(defaultKeyList[j], defaultCertList, true);
+                  for(int k = 0; k < defaultCertList.size(); k++)
+                    std::cout << "       +->* " << defaultCertList[k] << std::endl;
+                  std::vector<Name> otherCertList;
+                  keyChain.getAllCertificateNamesOfKey(defaultKeyList[j], otherCertList, false);
+                  for(int k = 0; k < otherCertList.size(); k++)
+                    std::cout << "       +->  " << otherCertList[k] << std::endl;
+                }
+              std::vector<Name> otherKeyList;
+              keyChain.getAllKeyNamesOfIdentity(otherIdList[i], otherKeyList, false);
+              for(int j = 0; j < otherKeyList.size(); j++)
+                {
+                  std::cout << "  +->  " << otherKeyList[j] << std::endl;
+                  std::vector<Name> defaultCertList;
+                  keyChain.getAllCertificateNamesOfKey(otherKeyList[j], defaultCertList, true);
+                  for(int k = 0; k < defaultCertList.size(); k++)
+                    std::cout << "       +->* " << defaultCertList[k] << std::endl;
+                  std::vector<Name> otherCertList;
+                  keyChain.getAllCertificateNamesOfKey(otherKeyList[j], otherCertList, false);
+                  for(int k = 0; k < otherCertList.size(); k++)
+                    std::cout << "       +->  " << otherCertList[k] << std::endl;
+                }
+              std::cout << std::endl;
+            }
+          return 0;
+        }
+      return 1;
+    }
+  catch(const SecPublicInfo::Error& e)
+    {
+      std::cerr << "ERROR: " << e.what() << std::endl;
+      return 1;
+    }
+  catch(const SecTpm::Error& e)
+    {
+      std::cerr << "ERROR: " << e.what() << std::endl;
+      return 1;
+    }
+}
+
+#endif //NDNSEC_LIST_HPP